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Proceedings Paper

Generation Of Precision Pixel Clock In Laser Printers And Scanners
Author(s): Gerald Toyen
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Paper Abstract

A new method of generating a pixel clock which can achieve fractional pixel registration across the entire film format without the need for precision servo control of the spinner motor is described. This method utilizes an auxiliary laser beam in parallel with the main writing/scanning beam. A description of several classical methods of generating precision pixel clocks for use with laser printers and laser scanners is included. The pixel placement accuracy achievable with each method is discussed along with advantages and limitations of each method. The auxiliary beam of the new method is first diverted from the writing beam just prior to its impinging the film and is then passed through an optical ruling. The modulated auxiliary beam is then collected on a photodetector. The resulting signal from the photodetector is used as a reference signal to which the pixel clock is phase locked. Generating the pixel clock in this manner not only produces accurate line-to-line pixel registration along the line, which is independent of perturbation in the scanner rotation, but also corrects for geometric distortions along the line length caused by the lens system.

Paper Details

Date Published: 10 January 1977
PDF: 8 pages
Proc. SPIE 0084, Laser Scanning Components and Techniques: Design Considerations/Trends, (10 January 1977); doi: 10.1117/12.954931
Show Author Affiliations
Gerald Toyen, General Dynamics Electronics Division (United States)

Published in SPIE Proceedings Vol. 0084:
Laser Scanning Components and Techniques: Design Considerations/Trends
Leo Beiser; Gerald F. Marshall, Editor(s)

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